With due deference to the learned Senior Advocate of Nigeria, it is settled law that evidence of a witness taken in an earlier proceedings is not relevant in a later trial or proceeding except for the purpose of discrediting such a witness in cross examination and for that purpose only. – Sanusi JCA. Enejo v. Nasir (2006)
RAISING AN APPEAL ON ADMITTED EVIDENCE
Chief Williams submits that a ruling on admissibility of evidence is provisional as a trial Judge in his final judgment may still exclude evidence that has been admitted if he discovers it has been wrongly admitted. In my respectful view, that submission appears rather too wide. The two authorities cited by him as supporting it do not go as far. In NIPC v. Thompson Organisation (1969) 1 NMLR 99, it is evidence that goes to no issue but wrongly admitted that is held should be expunged when considering the verdict. In Jacker v. International Cable Co. Ltd. 5 TLR 13, another case cited by Chief Williams, it was held there that where matter has been improperly received in evidence in the court of trial, even when no objection has been there raised, it is the duty of the Court of Appeal to reject it and to decide the case on legal evidence. With profound respect to the learned Senior Advocate these two decisions which he cited in oral argument before us do not support the rather wide submission he has made. In my view where evidence is tendered and objected to and the trial Judge, after full arguments by counsel for the parties, admits or rejects same, he cannot later, when considering his judgment reverse himself without hearing the parties; he cannot sit on appeal over his own judgment. Where evidence which goes to no issue has been inadvertently admitted the trial Judge is under a duty to disregard it when considering his verdict. If he fails to do so, an appellate court will.
— Michael Ekundayo Ogundare, JSC. Saraki v. Kotoye (1992) – S.C. 250/1991